EP1999957B1 - Method and system for enhancing transmission reliability of video information over wireless channels - Google Patents

Method and system for enhancing transmission reliability of video information over wireless channels Download PDF

Info

Publication number
EP1999957B1
EP1999957B1 EP07745691.1A EP07745691A EP1999957B1 EP 1999957 B1 EP1999957 B1 EP 1999957B1 EP 07745691 A EP07745691 A EP 07745691A EP 1999957 B1 EP1999957 B1 EP 1999957B1
Authority
EP
European Patent Office
Prior art keywords
packet
sub
crc
bits
packets
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP07745691.1A
Other languages
German (de)
French (fr)
Other versions
EP1999957A1 (en
EP1999957A4 (en
Inventor
Huai-Rong Shao
Harkirat Singh
Chiu Ngo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electronics Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to US78725006P priority Critical
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to PCT/KR2007/001528 priority patent/WO2007111484A1/en
Publication of EP1999957A1 publication Critical patent/EP1999957A1/en
Publication of EP1999957A4 publication Critical patent/EP1999957A4/en
Application granted granted Critical
Publication of EP1999957B1 publication Critical patent/EP1999957B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056Systems characterized by the type of code used
    • H04L1/007Unequal error protection
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056Systems characterized by the type of code used
    • H04L1/0061Error detection codes
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0078Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0083Formatting with frames or packets; Protocol or part of protocol for error control
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607Details of the supervisory signal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607Details of the supervisory signal
    • H04L1/1614Details of the supervisory signal using bitmaps
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. van Duuren system ; ARQ protocols
    • H04L1/1867Arrangements specific to the transmitter end
    • H04L1/1874Buffer management
    • H04L1/1877Buffer management for semi-reliable protocols, e.g. for less sensitive applications like streaming video
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. van Duuren system ; ARQ protocols
    • H04L1/1867Arrangements specific to the transmitter end
    • H04L1/1887Scheduling and prioritising arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L29/00Arrangements, apparatus, circuits or systems, not covered by a single one of groups H04L1/00 - H04L27/00
    • H04L29/02Communication control; Communication processing
    • H04L29/06Communication control; Communication processing characterised by a protocol
    • H04L29/0602Protocols characterised by their application
    • H04L29/06027Protocols for multimedia communication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements or protocols for real-time communications
    • H04L65/60Media handling, encoding, streaming or conversion
    • H04L65/607Stream encoding details
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00Network arrangements or protocols for real-time communications
    • H04L65/80QoS aspects
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2383Channel coding or modulation of digital bit-stream, e.g. QPSK modulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/4363Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network
    • H04N21/43637Adapting the video or multiplex stream to a specific local network, e.g. a IEEE 1394 or Bluetooth® network involving a wireless protocol, e.g. Bluetooth, RF or wireless LAN [IEEE 802.11]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/438Interfacing the downstream path of the transmission network originating from a server, e.g. retrieving MPEG packets from an IP network
    • H04N21/4382Demodulation or channel decoding, e.g. QPSK demodulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/60Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client 
    • H04N21/63Control signaling related to video distribution between client, server and network components; Network processes for video distribution between server and clients or between remote clients, e.g. transmitting basic layer and enhancement layers over different transmission paths, setting up a peer-to-peer communication via Internet between remote STB's; Communication protocols; Addressing
    • H04N21/637Control signals issued by the client directed to the server or network components
    • H04N21/6375Control signals issued by the client directed to the server or network components for requesting retransmission, e.g. of data packets lost or corrupted during transmission from server
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0075Transmission of coding parameters to receiver

Description

  • The present invention relates to transmission of video information and in particular to enhancing transmission reliability of video information.
  • With the proliferation of high quality video, an increasing number of electronic devices (e.g., consumer electronics devices) utilize high definition (HD) video which can require multiple gigabit per second (Gbps) in bandwidth for transmission. As such, when transmitting such HD video between devices, conventional transmission approaches compress the HD video to a fraction of its size to lower the required transmission bandwidth. The compressed video is then decompressed for consumption. However, with each compression and subsequent decompression of the video data, some data can be lost and the picture quality can be reduced.
  • The High-Definition Multimedia Interface (HDMI) specification allows the transfer of uncompressed HD signals between devices via a cable. While consumer electronics makers are beginning to offer HDMI-compatible equipment, there is not yet a suitable wireless (e.g., radio frequency (RF)) technology that is capable of transmitting uncompressed HD video signals. Wireless local area network (WLAN) and similar technologies can suffer interference issues when several devices are connected which do not have the bandwidth to carry the uncompressed HD signal, and do not provide an air interface to transmit uncompressed video over 60 GHz band.
  • US6757851 discloses an error control method for video bitstream data used in wireless communication. WO00/02320 discloses a method and apparatus for transmitting and receiving information packets using multi-layer error detection.
  • According to the invention, there is provided a method of communicating video information over a wireless channel as defined in claim 1 and a transmitter for communication of video information over a wireless channel according to claim 6.
  • Examples in the present disclosure further allow selective retransmission of video data based on human perceptual importance of such data.
  • Therefore, in the case of retransmission, the MSBs are given the highest retransmission preference to conserve bandwidth and reduce retransmission delay.
  • As is known to those skilled in the art, the example architectures according to the invention can be implemented in many different ways, such as program instructions for execution by a processor, as logic circuits, as an application specific integrated circuit, as firmware etc.
  • Description of the Drawings
    • Fig. 1 shows an example of a data packet including a payload of uncompressed video pixel components that has a bit complemented in transmission from a sender to a receiver over a wireless channel.
    • Fig. 2 shows a data packet with a payload comprising multiple sub-packets and multiple CRCs, for enhancing transmission reliability of uncompressed video packets over wireless channels, according to an embodiment of the present invention.
    • Fig. 3 shows sub-packet padding, according to an embodiment of the present invention.
    • Fig. 4 shows a data packet with a payload comprising multiple sub-packets, according to an embodiment of the present invention.
    • Fig. 5 shows a CRC Control Field in the Media Access Control (MAC) header of the data packet of Fig. 2, according to an embodiment of the present invention.
    • Fig. 6 shows another CRC Control Field in the MAC header of the data packet of
    • Fig. 2, according to an embodiment of the present invention.
    • Fig. 7 shows the details of a sub-packet in Fig. 2, according to an embodiment of the present invention.
    • Fig. 8 shows the details of a CRC calculation for the sub-packet in Fig. 7, according to an embodiment of the present invention.
    • Fig. 9 shows a timing diagram of an immediate retransmission method, according to an embodiment of the present invention.
    • Fig. 10 shows a retransmitted sub-packet, according to an embodiment of the present invention.
    • Fig. 11 shows a flowchart of a sub-packetization process by the sender, for constructing each sub-packet in the packet of Fig. 2, according to an embodiment of the present invention.
    • Fig. 12 shows a flowchart for sub-packet processing in a receiver and generating a responsive ACK packet (frame), according to an embodiment of the present invention.
    • Fig. 13 shows an example of an ACK packet, according to the present invention.
    • Fig. 14 shows a flowchart of a retransmission process implemented by the sender, according to an embodiment of the present invention.
    • Fig. 15 shows a functional block diagram of a wireless communication system implementing data packet transmission, according to an embodiment of the present invention.
    Best Mode
  • The video information includes pixels, each having a plurality of components and each component including video information bits that are places in sub-packets within a packet. Error detection information is determined for one or more sub-packets, and placed in the packet. Then the packet is transmitted from a transmitter to a receiver over a wireless channel, wherein the receiver uses the error detection information per sub-packet to check for transmission errors and request retransmission of erroneous video information bits based on their perceptual importance.
  • In one embodiment, this is achieved by sub-packetizing video information in each packet, and providing error detection/correction information including multiple cyclic redundancy code (CRC) checks, per sub-packet in each packet.
  • Upon receiving each packet, the receiver detects error based on the multiple CRC checks per sub-packet, and transmits an acknowledgment (ACK) packet to the sender, indicating such errors. The sender then selectively retransmits the information in the sub-packets received in error based on perceptual importance of such information.
  • These and other features, aspects and advantages of the present invention will become understood with reference to the following description, appended claims and accompanying figures.
  • Mode for Invention
  • This application claims priority from U.S. Provisional Patent Application Serial Number 60/787,250, filed on March 29, 2006 , incorporated herein by reference.
  • The present invention provides a method and system for enhancing transmission reliability of video information packets from a sender to a receiver over wireless channels (e.g., RF). In one embodiment, this is achieved by sub-packetizing uncompressed video information in each packet, and providing error detection/correction information, such as multiple CRC checks, per sub-packet in each packet.
  • Even if a wireless medium has enough bandwidth to support uncompressed HD 1080p video, in case of transmission errors in some video packets, it is not desirable to retransmit entire uncompressed video streams. Typically, a video frame of pixels is divided into multiple scan lines. Each scan line contains an integer number of pixels, which are denoted by a number of pixel components. Quantization for pixel depth, or bits per pixel component (bitplane), may be 8-bit, 10-bit, 12-bit or 16-bit values. A pixel component contains either a color component (chrominance) or a luminance component of the video. Considering an 8-bit quantization and a 60 frames/second, a one second long uncompressed video (1080p) segment can be expressed as 60 x 3 x 8 x 1420 x 1080= 2.98 gigabits. Typically, it is not possible to retransmit the entire stream from a sender (transmitter) to a receiver without violating the presentation deadline of a sink device such as a TV display.
  • Accordingly, the present invention further allows selective retransmission of video data based on human perceptual importance of such data. Given a frame of video pixels, wherein each pixel comprises multiple components (e.g., R, G, B), different bits of each pixel component do not equally affect the video quality. For example, a most significant bit (MSB) largely affects the uncompressed video quality, and therefore has a higher perceptual importance, compared to a least significant bit (LSB). Therefore, in the case of retransmission according to an embodiment of the present invention, the MSBs are given the highest retransmission preference to conserve bandwidth and reduce retransmission delay.
  • Example implementations of the present invention are now described. In many wireless communication systems, a frame structure is used for data transmission between a transmitter and a receiver. For example, the IEEE 802.11 standard uses frame aggregation in a Media Access Control (MAC) layer and a physical (PHY) layer. In a typical transmitter, a MAC layer receives a MAC Service Data Unit (MSDU) and attaches a MAC header thereto, in order to construct a MAC Protocol Data Unit (MPDU). The MAC header includes information such a source addresses (SA) and a destination address (DA). The MPDU is a part of a PHY Service Data Unit (PSDU) and is transferred to a PHY layer in the transmitter to attach a PHY header (i.e., PHY preamble) thereto to construct a PHY Protocol Data Unit (PPDU). The PHY header includes parameters for determining a transmission scheme including a coding/ modulation scheme.
  • Before transmission as a packet from a transmitter to a receiver, a preamble is attached to the PPDU, wherein the preamble can include channel estimation and synchronization information.
  • Fig. 1 presents an example of a conventional data packet 1, including a payload 2 of M uncompressed video pixel components, each component having an N bit bitplane, that is transmitted from a sender (e.g., uncompressed video stream source) to a receiver (e.g., uncompressed video stream sink) over a wireless channel. In addition to including the payload 2, the packet 1 includes a CRC value in a CRC field 4 for the video pixels, and the usual physical layer header (PHY HDR) 6 and MAC layer header (MAC HDR) 8.
  • In one example, during transmission, a MSB 7 of an N bit pixel component 9 in the payload 2 is complemented (i.e., corrupted), causing a CRC error at the receiver. In another example, during transmission, a LSB 5 of an N bit pixel component 9 in the payload 2 is complemented, causing a CRC error at the receiver. Since the CRC value comprises a checksum over the entire payload, it is not feasible to determine at the receiver whether the MSBs or the LSBs are corrupted. Moreover, retransmission of the payload when the LSB is complemented can be futile since a corrected LSB does not provide any discernable improvement to received video quality.
  • A transmission packet according to an embodiment of the present invention includes a payload of M pixel components, each pixel component comprising N bits, and the P = M x N payload bits are divided into K sub-packets of L bits each. Each sub-packet comprises a sub-packet header, a payload and a CRC sub-field, such that the sub-packet header includes a sequence number indicating the order of the corresponding sub-packet in the packet. The sequence number is assigned in monotonically increasing order starting from zero, whereby the sequence number of a first sub-packet is 0, and the sequence number of a Kth sub-packet is K - 1. The packet includes multiple CRC fields corresponding to the multiple sub-packets, wherein the CRC value for each sub-packet in a corresponding CRC sub-field in the packet.
  • Each sub-packet includes a plurality of subsets of bits in the sub-packet, wherein a CRC value for the information bits in each sub-packet is determined by further determining a CRC sub-value for each subset of bits, thereby generating a plurality of CRC sub-values for the corresponding plurality of subsets of bits.
  • The sender provides a CRC Control Field in a MAC header of the packet to signal the receiver how the sub-packets are formed for CRC computation and error detection at the receiver. The CRC Control Field includes: a CRC Count (CRCC) field that indicates the number of CRC values for the packet or per sub-packet, and a CRCBitmap field comprises an array of N bits, each of which corresponds to one of t he N bitplanes of a pixel, wherein a MSB of the CRCBitmap corresponds to a MSB bitplane, zero entries in the CRCBitmap identify bitplanes that are excluded from the CRC computation, and non-zero entries identify bitplanes that are included in the CRC computation.
  • Upon receiving a packet, based on the CRC values in the packet, the receiver determines corrupted information in each sub-packet, and generates an ACK packet to indicate the corrupted information to the sender. The ACK packet is transmitted to the sender, wherein based on the ACK packet, the sender generates a retransmit packet including information bits that are indicated as corrupted in the last packet by the ACK packet, and transmits the retransmit packet to the receiver.
  • The retransmit packet includes information bits that are indicated as corrupted in the last packet by the ACK packet, based on human perceptual importance of such information. Preferably, the retransmit packet includes only information bits that have high perceptual importance. For example, the retransmit packet includes only the MSBs of a corrupt sub-packet.
  • Fig. 2 shows an example transmission packet 10 according to the present invention, wherein an uncompressed video payload 2 of P = M x N bits is divided into K sub-packets 12 (i.e., Sub-packet 0, ..., Sub-packet K-1) of L bits each in the packet 10, for transmission to a wireless receiver over a channel (wherein M represents the number of pixel components, and N represents the number of bits in the bitplane of each pixel component). The sender and the receiver negotiate the value of L during a connection set-up phase therebetween. In one example, a video stream represents multiple pixels, each pixel having three components (e.g., R, G, B or Y, Cb, Cr), each component having multiple bits (e.g., classified as MSBs and LSBs), wherein in each sub-packet, the MSBs and LSBs can be separated or mixed together. In one example, each incoming information bit is placed into the sub-packet with available space to carry more bits. Then, when the sub-packet is full, the incomings are placed into a next sub-packet. In another example, it is also possible to place incoming bits within similar perceptual importance into the same sub-packet (e.g., one sub-packet with only MSBs, another with only LSBs, etc.). In yet another example, information bits with different perceptual importance can be mixed together in a sub-packet.
  • The packet 12 further includes a PHY HDR 16 and a MAC HDR 18. Each sub-packet 12 further includes multiple CRC values for the video payload stored therein (e.g., Fig. 7, CRC1 and CRC2 described further below). The CRC values correspond to different bitplanes in a sub-packet payload (e.g., Fig. 1, CRC1 for the MSBs and CRC2 for the LSBs, described further below).
  • The last sub-packet 12 in the packet 10 can be less than L bits, wherein as shown by example in Fig. 3 , the sender adds some padding bits 13 to the last sub-packet 12, to make the length of the last sub-packet 12 equal to L bits. The sender informs the receiver of the padding by including a delimiter 15 before the padding bits 13, wherein the delimiter 15 is known to the receiver. This allows the receiver to ignore the padding bits 13.
  • Fig. 4 shows another example packet 20 according to the present invention, wherein the sender can include K uncompressed video sub-packets 25 in the packet 20, each sub-packet 25 is L bits long, and the last packet includes padding data as necessary to bring it up to L bits. Thus, the total length of the payload is K x L = P bits.
  • Referring to Fig. 5 , the sender further places a CRC Control Field 21 in the MAC HDR 18 of the packet 10 in Fig. 2 (or packet 20 in Fig. 4) which indicates the structure of CRC information for the sub-packets 12. The receiver uses the information in the CRC Control Field 21 for CRC error detection, as described further below. As shown in Fig. 5, the CRC Control Field 21 includes a CRC Count (CRCC) field 22 that indicates the number of CRC values used for each sub-packet 12 of the payload in packet 10.
  • In this example, the CRCC field 22 is 4 bits long. The CRC Control Field 21 further includes a CRCBitmap field 23 which defines which bitplanes of the payload data in a sub-packet each CRC value corresponds to. In this example, the CRCBitmap field 23 comprises an array of N bits, each of which corresponds to one of the N bitplanes of a pixel (typical value for N is 8, 10, 12 or 16). The MSB of the CRCBitmap corresponds to the MSB bitplane. The zero entries in the CRCBitmap identify bitplanes that are excluded from the CRC computation, while non-zero entries identify bitplanes that are to be included.
  • For each sub-packet, each possible bitplane combination may be selected. Alternatively, bitplanes may be selected in conjunction with an Unequal Error Protection (UEP) mode. The CRCBitmap is repeated CRCC times (CRCC x N long), which indicates the number of bitplane combinations selected.
  • Fig. 6 shows an example of a CRC Control Field 21 including a CRCC field 22 and two CRCBitmap fields 23A and 23B, whereby the CRCC field 22 is set to 2, indicating that a sub-packet includes two CRC values for its payload (e.g., sub-packet 12 in Fig. 7 includes CRC1 and CRC2 for a payload 29). The first CRCBitmap 23A in Fig. 6 indicates that m MSBs out of N bitplanes in the sub-packet payload are used to compute a first CRC value for a sub-packet payload. The second CRCBitmap 23B indicates that r LSBs out of N bitplanes in the sub-packet payload are used to compute a second CRC value for the sub-packet payload. The values of m and r are negotiated by the sender and the receiver during the connection set-up phase.
  • Fig. 7 shows further details of each sub-packet 12 that is formed by the sender in the packet 10. Each sub-packet 12 includes a sub-packet header 28, a payload 29 and a CRC sub-field 30. The sub-packet header 28 includes a sequence number subfield 27 which is M bits, such that 2M ≥ K, indicating the sequential order of the corresponding sub-packet 12 in the packet 10. For each sub-packet 12, the corresponding sequence number 27 is assigned in monotonically increasing order starting from zero. Thus, the sequence number of the first sub-packet 12 is 0, and the sequence number of Kth sub-packet 12 is K - 1. The CRC sub-field 30 includes a CRC1 value in a field 30A and a second CRC2 value in a field 30B, which are each S bits long.
  • As shown diagrammatically in Fig. 8 , the first CRC value CRC1 is computed over X MSBs of the L bit sub-packet 12, and the second CRC value CRC2 is computed over Y LSBs of the same L bit sub-packet 12. The first CRCBitmap 23A (Fig. 6) indicates to the receiver the pattern of data in the sub-packet payload for which CRC1 is computed. The second CRCBitmap 23B (Fig. 6) indicates to the receiver the pattern of data in the sub-packet payload for which CRC2 is computed. For CRC computation, bits are not physically re-organized. Assuming, j pixel components in a video sub-packet 12, the relationship between m, r, L, X and Y can be expressed as: X = j x m
    Figure imgb0001
    Y = j x r
    Figure imgb0002
    L = X + Y
    Figure imgb0003
  • For application of UEP to a sub-packet payload, the sender uses a similar coding rate for the CRC values as well as the payload data.
  • In the above example, a sub-packet includes two subsets of bits, one subset X bits long, and another subset Y bits long, wherein a CRC value is calculated for each subset. The above example is applicable for calculating a number h of CRC values CRC i (i = 1, ..., h, wherein h > 2), for the information bits in each sub-packet 12. In that case, each sub-packet includes h > 2 subsets SS i (i = 1, ..., h) and each subset is B i (i =1, ..., h) bits in length. Each CRC value CRC i is calculated as over the bits B i in a corresponding subset SS i of the L bits in the sub-packet 12, wherein L = B1 +, ... +, B h For example, in Fig. 8, h = 2, B1 = X, B2 = Y, wherein CRC1 is computed over B1 bits of the L bit sub-packet, and CRC2 is computed over B2 bits of the L bit sub-packet.
  • Upon receiving the packet 10, the receiver performs CRC checks, and forms an ACK packet using a bitmap of K bits. For example, when bit i in the ACK bitmap is set to that the MSBs of the ith sub-packet 12 in the packet 10 are successfully received according to the CRC check by the receiver. When bit i in the ACK bitmap is set to zero, it indicates that the MSBs of the ith sub-packet are received in error. Thus, the ACK packet indicates the receipt status of the MSBs of the sub-packets 12 in the packet 10 to the sender. In this example, the ACK packet does not indicate the status of the LSBs of the sub-packets 12. For example, if the MSBs of a sub-packet 12 are correctly received based on the CRC check at the receiver using CRC1 (30A in Fig. 8), but the LSBs of the sub-packet 12 are incorrectly received based on the CRC check at the receiver using the CRC2 (30B in Fig. 8), the receiver sets the corresponding bit in the K bit ACK bitmap to '1.' This effectively signals the sender that a retransmission of the sub-packet is not necessary because the correctly received MSBs provide most of the perceptually important video information. This alleviates the need for retransmission of the LSBs which may not add much to the perceptual quality of the video information, thereby saving time and channel bandwidth. Table 1 below further describes the rules for setting the ACK bitmap.
  • Table 1: Rules for setting a bit corresponding to the sub-packet in the bitmap
  • [Table 1] [Table] Status of LSBs Status of MSBs Value of the bit in the ACK bitmap Correct Correct 1 Error Correct 1 Correct Error 0 Error Error 0
  • Upon receiving an ACK packet from the sender in response to transmission of a packet 10, the sender selectively retransmits erroneous MSBs based on their perceptual importance. During retransmission, the sender retransmits a new packet including the MSBs of a sub-packet 12 of the previously transmitted packet 10 that is indicated by the ACK bitmap in the ACK packet as erroneously received at the receiver. The sender does not include the LSBs in the retransmitted packet.
  • Because the sender selectively retransmits the erroneously received bits based on perceptual importance, the bandwidth required to support retransmissions is reduced. The sender retransmits only the erroneous MSBs as indicated by the ACK bitmap in the ACK packet. Because retransmissions introduce additional delay which negatively affects isochronous streams, such as uncompressed video streams, selective retransmission according to the present invention significantly reduces delay without degrading video quality.
  • Further, the receiver can partially recover the erroneous LSBs of a sub-packet 12 by reusing correctly received LSBs from adjacent sub-packets 12 in the packet 10. Similarly, if the receiver determines that retransmission of the erroneous MSBs in a sub-packet 12 cannot be received within the packet deadline (i.e., the time to display the packet or video pixels), the receiver can reuse correctly received MSBs from adjacent sub-packets in the packet 10 instead of the erroneous MSBs in the sub-packet 12.
  • When based on the ACK packet from the receiver it becomes necessary for the sender to retransmit a correct copy of erroneously received data. In one example, the sender retransmits sub-packets by immediate retransmission of the corrupted data to the receiver in a retransmission packet, as shown by the timing diagram in Fig. 9, according to the present invention. At time T1 the sender sends a packet 10 of uncompressed video pixel data (along with CRC fields) to the receiver, and at time T2 the receiver sends back an ACK packet 10A to the sender, indicating the corrupted data. Upon receiving an ACK packet from the receiver, the sender invokes essentially immediate retransmission of the corrupted data in a retransmission sub-packet 10R at time T3.
  • As shown by example in Fig. 10 , the retransmitted sub-packet 10R includes a sequence number field 32 which is copied from the sequence number sub-field 27 of the originally transmitted sub-packet 12. The sub-packet 10R further includes a payload 34 comprising of only the MSBs of the original payload 29 are included in the retransmitted sub-packet 10R. The sub-packet 10R further includes a CRC value CRC1 in a CRC field 36 for the payload 34. As described further below, in one example, the sub-packet 10R can be part of a general retransmit packet which includes one or more retransmit sub-packets 10R.
  • Fig. 11 shows an example flowchart of a sub-packetization process 40 by the sender, for constructing each sub-packet 12 in a MAC packet 10 (Fig. 7), comprising the steps of:
    • Step 42: Construct a new sub-packet 12 for the MAC packet 10, including a sub-packet header 28, and add a sequence number of the sub-packet 12 in the sequence number field 27.
    • Steep 44: Compute a first CRC (CRC1) over X MSBs of sub-packet payload 29, and compute a second CRC (CRC2) over Y MSBs of sub-packet payload 29.
    • Step 46: Determine if this is the last sub-packet for the MAC packet 10? Is not, go to step 49, otherwise go to step 48.
    • Step 48: Add delimiter 15 (Fig. 3) to the sub-packet 12.
    • Step 49: Provide the MAC packet 10 to a PHY layer of the sender to send to the receiver.
  • After all of the sub-packets 12 for the MAC packet 10 are constructed, a CRC Control Field 21 is placed in the MAC HDR 18 of the MAC packet 10, and the (MAC) packet 10 is then transmitted from the sender to the receiver over a wireless channel. In another implementation, rather than placing a CRC Control Field 21 in the MAC HDR 18 of the MAC packet 10, the sender and the receiver negotiate a CRC Control Field by exchanging management or control frames. Whenever the sender or receiver wishes to change the CRC Control Field, they exchange another set of control or management frames to successfully negotiate a new value for the CRC Control Field.
  • Fig. 12 shows an example flowchart of a process 50 at the receiver for checking each sub-packet 12 in a received MAC packet 10, to generate an ACK packet 10A ( Fig. 13 ) in response, comprising the steps of:
    • Step 52: Compute a CRC check over X MSBs of the received sub-packet 12.
    • Step 53: Based on the computed CRC, determine if the X MSBs were received successfully? If yes, then go to step 55, otherwise go to step 54.
    • Step 54: Set the corresponding bit in the ACK bitmap of the ACK packet to '0'.
    • Step 55: Set the corresponding bit in the ACK bitmap of the ACK packet to '1'.
  • Fig. 14 shows a flowchart of an example retransmission process 56 implemented by the sender after sending a packet to the receiver. The sender constructs a retransmit packet including one or more retransmit sub-packets 10R, according to the steps of:
    • Step 57 : Receive an ACK packet from the receiver.
    • Step 58 : Construct an initial retransmit packet, and set an index F (non-zero) to the number of sub-packets which are acknowledged in the ACK packet. In order to meet the playback deadline per packet at the receiver, a re-transmit packet 10R has higher priority than a normal transmit packet 10 packet. Further, a packet which has been re-transmitted more times has higher priority than a packet which has been re-transmitted less times or one that has not been retransmitted yet.
    • Step 60 : If F > 0, then go to step 62, otherwise go to step 70.
    • Step 62 : Based on the ACK packet, determine if the Fth sub-packet in the last transmitted packet requires retransmission? If yes, go to step 64, otherwise go to step 68.
    • Step 64 : Determine if there is sufficient time left to re-transmit the Fth sub-packet based on the receiver side playback deadline for each sub-packet? If not, go to step 70, otherwise, go to step 66.
    • Step 66 : Include the Fth sub-packet in the retransmit packet.
    • Step 68 : Decrement F (e.g., by one), and go back to step 60.
    • Step 70 : Send a retransmit packet to the PHY layer for transmission to the receiver.
  • In another example, the sender invokes delayed retransmissions of corrupted data. Initially the sender sends Q packets 10 of video pixel data with CRC fields to the receiver, the receiver transmits back Q corresponding ACK packets to the sender, and the sender receives Q corresponding ACK packets from the receiver. As such, the sender collects Q ACK packets. Based on the collected ACK packets, the sender determines the sub-packets in the last Q packets that need retransmissions. Then, the sender begins a retransmission phase by retransmitting the corrupted sub-packets from the highest priority sub-packet in perceptual importance, and continues until it can retransmit other sub-packets in order of priority in perceptual importance, without violating the receiver's presentation deadline.
  • The sender includes the necessary signaling information in retransmissions so that the receiver can determine which sub-packets are retransmitted and to which packets they belong to. Assuming N bits per pixel component and retransmission after Q packets, at most N x Q bits are needed to signal the presence/absence of each sub-packet in said retransmissions.
  • Fig. 15 shows a functional block diagram of an example wireless communication system 100 implementing data packet transmission, wherein each packet comprises multiple sub-packets, multiple CRCs and selective retransmissions, for enhancing transmission reliability of uncompressed video packets over wireless channels, according to an embodiment of the present invention. The system 100 includes a wireless sender 102 and a wireless receiver 104. The sender 102 includes a PHY layer 106 and a MAC layer 108. Similarly, the receiver 104 includes a PHY layer 114 and a MAC layer 116. The PHY and MAC layers provide wireless communication between the sender 102 and the receiver 104 via antennas through wireless medium 101.
  • The sender 102 further includes a sub-packetization module 110 that receives uncompressed video from higher levels (e.g., a video source such as a HDVD player), and generates sub-packets of uncompressed video from the uncompressed video pixels, as described above, according to the present invention. The sender 102 further includes a CRC generation module 112 that generates said CRC Control Field and CRC values, as described above. The generated sub-packets along with the CRC Control Field and CRC values are placed in a packet 10 by the MAC layer 108, and transmitted by the PHY layer 106. The sender 102 further includes a retransmission controller 113 that implements the retransmission of corrupted data, as described above according to the present invention.
  • In the wireless receiver 104, the PHY/MAC layers 114/116, process each received packet. The receiver 104 further includes a CRC validation and error detection module 117 that uses the CRC Control Field and CRC values per packet to validate the CRC value and detect errors in the sub-packets in each packet accordingly. The receiver 104 further includes an ACK frame generation module 118 that in conjunction with the MAC layer generates said ACK packet to indicate to the sender which sub-packets in a packet are corrupted. The receiver 104 further includes an error correction module 119 that receives retransmitted sub-packets from the sender and provides corrected uncompressed video pixels to higher layers for consumption (e.g., display).
  • Though in Fig. 15, modules 117, 118 and 114 in the receiver 104 are shown separate from the MAC layers 116, one or more of the modules 117, 118 and 114 can be a component of the MAC layer 116. Similarly, one or more of the modules 110, 112 and 113 in the sender can be a component of the MAC layer 108.

Claims (4)

  1. A method of communicating video information over a wireless channel, comprising the steps of:
    inputting video pixels, wherein each pixel includes a plurality of components and each component comprises video information bits;
    forming a packet from the video information bits by sub-packetizing the video information bits into sub-packets (12);
    determining error detection information for each of the sub-packets (12); and
    inserting the error detection information in the sub-packets,
    wherein each sub-packet (12) comprises a plurality of subsets of video information bits;
    characterised in that
    determining the error detection information for each of the sub-packets comprises determining a CRC value (30A, 30B) for each subset of the bits in the sub-packet, such that after inserting the error detection information in the sub-packets, each sub-packet includes the plurality of subsets of bits and a plurality of corresponding CRC values,
    wherein the plurality of subsets of video information bits in each sub-packet comprise a first subset that includes the most significant bits and a second subset that includes the least significant bits, and
    wherein the method further comprises:
    arranging the sub-packets to form a packet (10):
    inserting a CRC Control Field in a MAC header of the packet to provide the receiver with information for performing CRC error detection for each of the subsets of information bits when the packet is received; and
    transmitting the packet (10) to a receiver over the wireless channel.
    wherein the CRC Control Field comprises an array of N bits which identifies the subset of bits for which a corresponding CRC value is determined, each bit of the array corresponding to one of N bitplanes of one of the video pixels, and the most significant bit of the array corresponding to the most significant bit of said N bitplanes, and
    wherein entries in the array having a first binary value identify bitplanes that are excluded from the CRC computation, and entries in the array having the opposite binary value to the first binary value identify bitplanes that are included in the CRC computation.
  2. The method of claim 2, wherein the CRC Control Field indicates the number of CRC values in the packet.
  3. A transmitter (102) for communication of video information over a wireless channel, the video information including video information bits, the transmitter comprising:
    a packetizer (110) configured to forma plurality of sub-packets (12) by sub-packetizing the video information bits, into sub-packets (12); and
    an error detection information generator (112) that generates error detection information for each of the sub-packets,
    wherein each sub-packet (12) comprises a plurality of subsets of video information bits;
    characterised in that the error detection information generator is arranged to determine a CRC value (30A, 30B) for each of the subsets of the bits in the sub-packet, such that after inserting the error detection information in the sub-packets, each sub-packet includes the plurality of subsets of bits and a plurality of corresponding CRC values,
    wherein the plurality of subsets of video information bits in each sub-packet comprise a first subset that includes the most significant bits and a second subset that includes the least significant bits,
    wherein the packetizer is further configured to form a packet (10) from the plurality of sub-packets (12), and the transmitter further comprises:
    a transmission module configured to transmit the packet and error detection information over the wireless channel,
    wherein the packet includes a CRC Control Field in a MAC header of the packet to provide a receiver with information for performing CRC error detection for each of the subsets of information bits when the packet is received,
    wherein the CRC Control Field comprises an array of N bits which identifies the subset of bits for which a corresponding CRC value is determined, each bit of the array corresponding to one of N bitplanes of one of the video pixels, and the most significant bit of the array corresponding to the most significant bit of said N bitplanes, and
    wherein entries in the array having a first binary value identify bitplanes that are excluded from the CRC computation, and entries in the array having the opposite binary value to the first binary value identify bitplanes that are included in the CRC computation.
  4. The transmitter of claim 3, wherein the CRC Control Field indicates the number of CRC values in the packet.
EP07745691.1A 2006-03-29 2007-03-29 Method and system for enhancing transmission reliability of video information over wireless channels Active EP1999957B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US78725006P true 2006-03-29 2006-03-29
PCT/KR2007/001528 WO2007111484A1 (en) 2006-03-29 2007-03-29 Method and system for enhancing transmission reliability of video information over wireless channels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP14186410.8A EP2819334B1 (en) 2006-03-29 2007-03-29 Method and system for enhancing transmission reliability of video information over wireless channels

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP14186410.8A Division EP2819334B1 (en) 2006-03-29 2007-03-29 Method and system for enhancing transmission reliability of video information over wireless channels

Publications (3)

Publication Number Publication Date
EP1999957A1 EP1999957A1 (en) 2008-12-10
EP1999957A4 EP1999957A4 (en) 2010-05-05
EP1999957B1 true EP1999957B1 (en) 2014-10-22

Family

ID=38541367

Family Applications (2)

Application Number Title Priority Date Filing Date
EP14186410.8A Active EP2819334B1 (en) 2006-03-29 2007-03-29 Method and system for enhancing transmission reliability of video information over wireless channels
EP07745691.1A Active EP1999957B1 (en) 2006-03-29 2007-03-29 Method and system for enhancing transmission reliability of video information over wireless channels

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP14186410.8A Active EP2819334B1 (en) 2006-03-29 2007-03-29 Method and system for enhancing transmission reliability of video information over wireless channels

Country Status (7)

Country Link
US (1) US7979784B2 (en)
EP (2) EP2819334B1 (en)
JP (1) JP5345517B2 (en)
KR (1) KR20080106159A (en)
CN (1) CN101395911B (en)
MX (1) MX2008012469A (en)
WO (1) WO2007111484A1 (en)

Families Citing this family (48)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8665967B2 (en) * 2006-02-15 2014-03-04 Samsung Electronics Co., Ltd. Method and system for bit reorganization and packetization of uncompressed video for transmission over wireless communication channels
US8363675B2 (en) * 2006-03-24 2013-01-29 Samsung Electronics Co., Ltd. Method and system for transmission of uncompressed video over wireless communication channels
US7782836B2 (en) * 2006-03-24 2010-08-24 Samsung Electronics Co., Ltd. Method and system for transmission of different types of information in wireless communication
US8432938B2 (en) * 2006-03-29 2013-04-30 Samsung Electronics Co., Ltd. Method and system for video stream transmission over wireless channels
US20070230461A1 (en) * 2006-03-29 2007-10-04 Samsung Electronics Co., Ltd. Method and system for video data packetization for transmission over wireless channels
US8306060B2 (en) * 2006-11-07 2012-11-06 Samsung Electronics Co., Ltd. System and method for wireless communication of uncompressed video having a composite frame format
US8169995B2 (en) * 2006-12-04 2012-05-01 Samsung Electronics Co., Ltd. System and method for wireless communication of uncompressed video having delay-insensitive data transfer
US8175041B2 (en) 2006-12-14 2012-05-08 Samsung Electronics Co., Ltd. System and method for wireless communication of audiovisual data having data size adaptation
KR100984811B1 (en) * 2007-03-27 2010-10-01 삼성전자주식회사 Apparatus and method for transmitting/receiving data
US8379622B2 (en) * 2007-06-15 2013-02-19 Motorola Mobility Llc Method and apparatus for reusing packet data control assignment bits for resource allocation indications
DE102007032659A1 (en) * 2007-07-13 2009-01-15 Knick Elektronische Messgeräte GmbH & Co. KG Method for telegram-based data transmission in a serial communication protocol and this data transmission device used
US8594093B2 (en) 2007-07-19 2013-11-26 Electronics And Telecommunications Research Institute Apparatus and method for transmit/receive of image data
JP2009033644A (en) * 2007-07-30 2009-02-12 Nec Electronics Corp Packet communication apparatus and communication line quality analyzing method
WO2009020288A1 (en) 2007-08-09 2009-02-12 Samsung Electronics Co., Ltd. Apparatus and method for searching for erroneous data
US8127206B2 (en) * 2007-09-13 2012-02-28 Samsung Electronics Co., Ltd. System and method for wireless communication of uncompressed video having reed-solomon code error concealment
JP5280781B2 (en) * 2007-10-30 2013-09-04 三星電子株式会社Samsung Electronics Co.,Ltd. Method and apparatus for generating reception confirmation frame
US8386892B1 (en) * 2007-11-05 2013-02-26 Massachusetts Institute Of Technology Partial packet recovery for wireless networks
US8205126B2 (en) * 2007-11-27 2012-06-19 Samsung Electronics Co., Ltd. System and method for wireless communication of uncompressed video using selective retransmission
US8656248B2 (en) * 2007-12-13 2014-02-18 Qualcomm Incorporated Hierarchical CRC scheme
US8176524B2 (en) * 2008-04-22 2012-05-08 Samsung Electronics Co., Ltd. System and method for wireless communication of video data having partial data compression
US9312989B2 (en) * 2008-07-07 2016-04-12 Cisco Technology, Inc. Importance-based FEC-aware error-repair scheduling
US8422518B2 (en) * 2008-08-19 2013-04-16 Integrated Device Technology, Inc. Managing transmit jitter for multi-format digital audio transmission
US8249010B2 (en) * 2008-11-05 2012-08-21 Huawei Technologies Co., Ltd. Method and apparatus for feeding back and receiving acknowledgement information of semi-persistent scheduling data packets
KR100930733B1 (en) * 2008-11-19 2009-12-09 정진현 A concrete slurry transporting pipe for concrete pump-car
US8553547B2 (en) * 2009-03-30 2013-10-08 Broadcom Corporation Systems and methods for retransmitting packets over a network of communication channels
WO2011022006A1 (en) * 2009-08-19 2011-02-24 Integrated Device Technology, Inc. Managing transmit jitter for multi-format digital audio transmission
JP2011055288A (en) 2009-09-02 2011-03-17 Toshiba Corp Visible light communication apparatus and data receiving method
GB2496862B (en) * 2011-11-22 2016-06-01 Canon Kk Communication of data blocks over a communication system
KR101639929B1 (en) * 2012-03-02 2016-07-14 엘에스산전 주식회사 Communication device and communication method
GB2506349B (en) * 2012-09-21 2015-12-16 Canon Kk Method and device for transmitting uncompressed video streams
US9559806B2 (en) * 2012-12-04 2017-01-31 Dali Systems Co. Ltd. Power amplifier protection using a cyclic redundancy check on the digital transport of data
EP2938147A4 (en) * 2013-01-18 2015-12-30 Huawei Tech Co Ltd Information transmission method and device
US20150326884A1 (en) * 2014-05-12 2015-11-12 Silicon Image, Inc. Error Detection and Mitigation in Video Channels
US9756146B2 (en) * 2015-05-19 2017-09-05 Intel IP Corporation Secure boot download computations based on host transport conditions
US20170099119A1 (en) * 2015-10-02 2017-04-06 Samsung Electronics Co., Ltd. Signalling of checksum for 802.11 mac headers
US10097203B2 (en) * 2015-11-12 2018-10-09 Nvidia Corporation Lane-striped computation of packet CRC to maintain burst error properties
US10784901B2 (en) 2015-11-12 2020-09-22 Qualcomm Incorporated Puncturing for structured low density parity check (LDPC) codes
DE102015122458A1 (en) * 2015-12-21 2017-06-22 Intel IP Corporation Communication device and method for signal determination
US10454499B2 (en) 2016-05-12 2019-10-22 Qualcomm Incorporated Enhanced puncturing and low-density parity-check (LDPC) code structure
US10313057B2 (en) 2016-06-01 2019-06-04 Qualcomm Incorporated Error detection in wireless communications using sectional redundancy check information
US9917675B2 (en) 2016-06-01 2018-03-13 Qualcomm Incorporated Enhanced polar code constructions by strategic placement of CRC bits
US10291354B2 (en) 2016-06-14 2019-05-14 Qualcomm Incorporated High performance, flexible, and compact low-density parity-check (LDPC) code
BR112019001032A2 (en) 2016-07-27 2019-04-30 Qualcomm Inc bit design hybrid automatic repeat request feedback (HARQ) for polar codes
CN109245860B (en) * 2017-04-28 2020-03-20 华为技术有限公司 Data processing method and data processing device
US10312939B2 (en) 2017-06-10 2019-06-04 Qualcomm Incorporated Communication techniques involving pairwise orthogonality of adjacent rows in LPDC code
KR20200020782A (en) 2017-07-07 2020-02-26 퀄컴 인코포레이티드 Communication techniques applying low-density parity-check code base graph selection
WO2019214444A1 (en) * 2018-05-08 2019-11-14 深圳市心流科技有限公司 Data transmission method, device and computer readable storage medium
WO2020076380A1 (en) * 2018-10-11 2020-04-16 Futurewei Technologies, Inc. System and method for retransmission of individual codewords

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030033417A1 (en) * 2000-12-15 2003-02-13 Qiuzhen Zou Generating and implementing a communication protocol and interface for high data rate signal transfer
US20040083417A1 (en) * 2002-10-29 2004-04-29 Lane Richard D. Multimedia transmission using variable error coding rate based on data importance

Family Cites Families (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5375818A (en) * 1976-12-17 1978-07-05 Toshiba Corp Signal transmission device
JPH04370583A (en) * 1991-06-20 1992-12-22 Mitsubishi Electric Corp Digital signal recording and reproducing device
JPH07105638A (en) * 1993-10-05 1995-04-21 Matsushita Electric Ind Co Ltd Picture data recording and reproducing device
US6161207A (en) * 1996-11-15 2000-12-12 Motorola, Inc. Communications unit and method of communicating having efficient packet acknowledgement
JP3726986B2 (en) * 1997-08-07 2005-12-14 ソニー株式会社 Communication method, transmission device, reception device, and cellular radio communication system
US6405338B1 (en) * 1998-02-11 2002-06-11 Lucent Technologies Inc. Unequal error protection for perceptual audio coders
US6173431B1 (en) 1998-07-01 2001-01-09 Motorola, Inc. Method and apparatus for transmitting and receiving information packets using multi-layer error detection
US6681364B1 (en) 1999-09-24 2004-01-20 International Business Machines Corporation Cyclic redundancy check for partitioned frames
KR100677070B1 (en) 1999-10-02 2007-02-01 삼성전자주식회사 Error control method for video bitstream data in wireless multimedia communication and computer readable medium therefor
DE60020672T2 (en) * 2000-03-02 2005-11-10 Matsushita Electric Industrial Co., Ltd., Kadoma Method and apparatus for repeating the video data frames with priority levels
US7346037B2 (en) 2001-03-26 2008-03-18 Lg Electronics Inc. Method of transmitting or receiving a data packet in packet data communication system using hybrid automatic repeat request
JP2003008553A (en) * 2001-06-22 2003-01-10 Mitsubishi Electric Corp Transmitter, receiver, transmitter-receiver and communication system
EP1271955A3 (en) * 2001-06-26 2007-05-02 Philips Electronics N.V. Method for packet transmission using packet retransmission requests, and mechanism for controlling transmission of such requests
US7043681B2 (en) * 2002-05-03 2006-05-09 Ibiquity Digital Corporation Digital audio broadcasting method and apparatus using complementary pattern-mapped convolutional codes
AU2003268755A1 (en) 2002-10-08 2004-05-04 Matsushita Electric Industrial Co., Ltd. Transmission data structure, data receiving method, data receiving apparatus, and data receiving program
US7346018B2 (en) 2003-01-16 2008-03-18 Qualcomm, Incorporated Margin control in a data communication system
KR100996029B1 (en) 2003-04-29 2010-11-22 삼성전자주식회사 Apparatus and method for coding of low density parity check code
US7474677B2 (en) * 2003-08-12 2009-01-06 Bose Corporation Wireless communicating
KR100556911B1 (en) * 2003-12-05 2006-03-03 엘지전자 주식회사 Video data format for wireless video streaming service
WO2006016745A1 (en) 2004-08-12 2006-02-16 Samsung Electronics Co., Ltd. Method and apparatus for transmitting ack frame
US7599363B2 (en) 2004-08-13 2009-10-06 Samsung Electronics Co. Ltd Method for reporting reception result of packets in mobile communication system
KR100961743B1 (en) 2005-12-09 2010-06-07 삼성전자주식회사 Apparatus and method for supporting relay service in multi-hop relay broadband wireless access communication system
US8665967B2 (en) 2006-02-15 2014-03-04 Samsung Electronics Co., Ltd. Method and system for bit reorganization and packetization of uncompressed video for transmission over wireless communication channels
WO2008015742A1 (en) 2006-08-02 2008-02-07 Fujitsu Limited Receiver apparatus and decoding method thereof
US7826436B2 (en) 2007-10-01 2010-11-02 Samsung Electronics Co., Ltd. Method and system for wireless communication of data with a fragmentation pattern and low-density parity-check codes
US7889707B2 (en) 2007-10-02 2011-02-15 Samsung Electronics Co., Ltd. Method and system for unequal error protection with block codes for wireless transmission

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030033417A1 (en) * 2000-12-15 2003-02-13 Qiuzhen Zou Generating and implementing a communication protocol and interface for high data rate signal transfer
US20040083417A1 (en) * 2002-10-29 2004-04-29 Lane Richard D. Multimedia transmission using variable error coding rate based on data importance

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Video coding for low bit rate communication; H.263 (01/05)", ITU-T STANDARD, INTERNATIONAL TELECOMMUNICATION UNION, GENEVA ; CH, no. H.263 (01/05), 13 January 2005 (2005-01-13), pages 1 - 226, XP017464281 *

Also Published As

Publication number Publication date
US7979784B2 (en) 2011-07-12
CN101395911A (en) 2009-03-25
EP2819334B1 (en) 2018-05-30
MX2008012469A (en) 2008-10-10
EP2819334A1 (en) 2014-12-31
CN101395911B (en) 2012-03-28
JP2009531948A (en) 2009-09-03
JP5345517B2 (en) 2013-11-20
WO2007111484A1 (en) 2007-10-04
US20070234134A1 (en) 2007-10-04
EP1999957A1 (en) 2008-12-10
KR20080106159A (en) 2008-12-04
EP1999957A4 (en) 2010-05-05

Similar Documents

Publication Publication Date Title
US10425462B2 (en) Multimedia streams which use control information to associate audiovisual streams
US10014977B2 (en) Systems and methods for transmitting data
US9306708B2 (en) Method and apparatus for retransmission decision making
US9350491B2 (en) System and method for mitigating burst noise in a communications system
JP6067637B2 (en) Packet level erasure protection coding in transmission of aggregated packets
USRE46167E1 (en) Systems and methods for transmitting data over lossy networks
US7089478B2 (en) FEC block reconstruction system, method and computer program product for mitigating burst noise in a communications system
US7577093B2 (en) Data communication system, data transmission apparatus, data receiving apparatus, data communication method, data transmission method, received-data processing method, and computer program
US7633970B2 (en) MAC header compression for use with frame aggregation
KR101216099B1 (en) Method of transmitting data stream and device thereof in a mobile communication system
US9832745B2 (en) Transport stream packets with time stamp generation by medium access control
EP2078396B1 (en) Wireless hd mac frame format
Singh et al. A 60 GHz wireless network for enabling uncompressed video communication
US7760700B2 (en) Fast control messaging mechanism for use in wireless network communications
US7525993B2 (en) Robust transmission system and method for mobile television applications
US8300563B2 (en) Aggregated transmission in WLAN systems with FEC MPDUs
CN101809952B (en) System and method for wireless communication having delay-insensitive data transfer
JP4834072B2 (en) Block acknowledgment protocol for wireless packet networks
KR101385265B1 (en) Data communication system, data sending apparatus, data sending method, data receiving apparatus, and data receiving method
EP2265078B1 (en) Method for receiving status information of a device
JP5295253B2 (en) Method and system for wireless information transmission
US20110317719A1 (en) Data link layer headers
US7502818B2 (en) Data communications system, data sender, data receiver, data communications method, and computer program
US8006168B2 (en) Apparatus and method for applying unequal error protection during wireless video transmission
US7904777B2 (en) Method and system for generating block acknowledgements in wireless communications

Legal Events

Date Code Title Description
17P Request for examination filed

Effective date: 20080923

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR NL

RBV Designated contracting states (corrected)

Designated state(s): DE FR NL

DAX Request for extension of the european patent (to any country) (deleted)
A4 Supplementary search report drawn up and despatched

Effective date: 20100401

17Q First examination report despatched

Effective date: 20100727

RAP1 Rights of an application transferred

Owner name: SAMSUNG ELECTRONICS CO., LTD.

REG Reference to a national code

Ref country code: DE

Ref legal event code: R079

Ref document number: 602007038979

Country of ref document: DE

Free format text: PREVIOUS MAIN CLASS: H04N0007120000

Ipc: H04L0001000000

RIC1 Information provided on ipc code assigned before grant

Ipc: H04L 29/06 20060101ALI20140402BHEP

Ipc: H04L 1/16 20060101ALI20140402BHEP

Ipc: H04N 21/2383 20110101ALI20140402BHEP

Ipc: H04N 21/438 20110101ALI20140402BHEP

Ipc: H04L 1/12 20060101ALI20140402BHEP

Ipc: H04L 1/00 20060101AFI20140402BHEP

Ipc: H04N 21/6375 20110101ALI20140402BHEP

Ipc: H04L 1/18 20060101ALI20140402BHEP

Ipc: H04N 21/4363 20110101ALI20140402BHEP

INTG Intention to grant announced

Effective date: 20140530

INTG Intention to grant announced

Effective date: 20140604

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR NL

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602007038979

Country of ref document: DE

Effective date: 20141204

REG Reference to a national code

Ref country code: NL

Ref legal event code: T3

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602007038979

Country of ref document: DE

26N No opposition filed

Effective date: 20150723

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 10

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 11

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 12

PGFP Annual fee paid to national office [announced from national office to epo]

Ref country code: DE

Payment date: 20190220

Year of fee payment: 13

PGFP Annual fee paid to national office [announced from national office to epo]

Ref country code: DE

Payment date: 20190220

Year of fee payment: 13

Ref country code: FR

Payment date: 20190225

Year of fee payment: 13

PGFP Annual fee paid to national office [announced from national office to epo]

Ref country code: NL

Payment date: 20200221

Year of fee payment: 14